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Sir J. Sebright expressly experimentised for this object, and failed. Certainly, a breed intermediate between TWO VERY DISTINCT breeds could not be got without extreme care and long-continued selection; nor can I find a single case on record of a permanent race having been thus formed.
He is as emphatic in his conclusion that some hybrids are perfectly fertile as fertile as the pure parent-species as are Kolreuter and Gartner that some degree of sterility between distinct species is a universal law of nature. He experimentised on some of the very same species as did Gartner.
But a serious cause of error seems to me to be here introduced: a plant to be hybridised must be castrated, and, what is often more important, must be secluded in order to prevent pollen being brought to it by insects from other plants. Nearly all the plants experimentised on by Gärtner were potted, and apparently were kept in a chamber in his house.
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